Grease-plug.



o. NATERRY. GREASE PLUG.

APPLICATION FILED APR. 7, 1908.'

` www@ Nos/.21, 1911.

' 0. N. TERRY.

` GREASE PLUG. APPLIOATION P11131; Amm?, 190s.

l S,E091 l S. 1 Patgnted 1101.21, 1911.

2 SHEETS-SHEET 2.

wrench.,

UNrrEi) strain:sl PATE fr rricu.

OTIS TERRY., OF LINCOLN, NEBRASKA, ASSIGNOR Ol? ONE-HAIF TO ROBERT D.

y SMITH, 0F BOSTON, MASSACHUSETTS.

GREASE-PLUG.

Application filed April 7, 1908. Serial No. 425,682.

A To all whom it may concern:

Be it known that l, Oris N. TERRY, acitizen of the United States,residing at Lincoln, in the county ot Lancaster and State of Nebraska,have invented certain new and useful Improvements in Grease-Plugs, ofwhich the following is a specification.

The object of my invention is to provide an improved closure for greasecups which shall be held in .place by engagement with the grease in thecup. This object and others Will be made apparent in the followingspeciiication and claims, taken in connection with the accompanyingdrawings, in which- Figure l is an axial section of a grease cup havinga grease plug embodying one forni of my invention. Fig. 2 is anelevation (partly in section) of a modification. Fig. 3 is an end view'of the plug shown in Fig. 2. Figs. et and 5 are, respectively, an endelevation. and end view of another niodiiieation. Figs. 6, 7 and 8 are,respeetirely, an. elevation, end view and perspective view of a fourthtorni. Figs. 9 and 10 are, re-

spectively, longitudinal sections and end views of a itli forni. Fig."ll is a bottoniI end view oi' a bushing which may be used with anordinary grease plug and grease cup; and Fig. 12 is an axial section or"the same.

In lubricating machinery. with more or less solid lubricants or greases,it'is common to' have a grease cup, which is represented by thereference numeral 17, having nipple 18 adapted to be connected to a ductleading to theY part to be lubricated. This cup is closed by a plug 16.The parts described thus far are old in the art. The plug 1G nia closethe cup 17 by having a screw threaded engagement therewith, or with abushing as shown in F ig. l. ln such case the top end l5 of the plug ispreferablyy squared to permit the application of a To save weight andmaterial the plug li may preferably he made hollow.

Considerable diiiiculty has been experienced Y with grease plugs onaccount of their tendency to become looseby jarring.

My invention consists in so modifying an ordinary grease plug as'tolprevent it from becoming detached from the grease cup.

Broadly speaking, niy invention consists in so extending 'the surface ofthe end of the grease plug in contact with the grease tliatthere/sliallbe a considerable area of Contact, whereby the grease will hold the plugfrom escaping. n

Ot the many forms which my invention may take I have illustrated -a fewin the accompanying drawings, throughout which the reference numeral l2)represents the ordinary flat end. of the grease plug. In Figs. and 3this is extended in the form of a rib or vane 20 which is surrounded bythe grease 20a. In Fig. Lthe end surface 19 is increased by a conicalprojection 21. ln Figs.'

4 and 5 the surface in Contact with the grease is increased by cuttingshort longitudinal channels .22 around the sides of the plug 16. In (i,7 and 8 a vane 25 has one end 2 adapted to receive a pivot pin 24 whichalso engages a pinjeet'ion 23 from the-end surface 1.9. This vaneisoblique as 1s shown clearly in Fig. 8, the inclination being such thatwhen the plug is'beingv screwed into the grease cup the vane 25 ridesupon the grease, but as lsoon as the plug starts to unscrew Athe vane 25digs down into the grease thus engaging it and thereby preventing the'escape of the plug. In Figs. 9 and l0 a recess 27 extends into theend-19 of the pliigthus increasing the sur- .face in Contact with thegrease. This recess and come in contact with the sides of the externallyscrew threaded cylindrical grease plug which may bescrewed down invengagement with the internal screw threads 3l. rlliisbushing. incombination with the foim ofplug illustrated in Fig. l, is rei-yei'lective. The bushing 2Q when screwed into a grease cup serves toprovide the latter with interior longitudinal grooves, mentioned inseine of the following claims. l't is obvious that the gr 'se cup mightbe constructed integrally with suoli grooves, thus doing away with thenecessity for the busliing. When thus' combined, the grease is forcedalong the grooves 3Q and fills into the I ing screw threaded engagementtherewith,

an extended area to comein Contact `with space behind theconicalprojection 21. The combination of a grease cup and plug with thisform of bushing is shown in Fig. 1.

Many more forms of my invention might readily be devised in View ofthe'disclosure herein given, but it is thought that this'will besuiieient to illustrate the principle involved. The adhesion of thegrease'to'- the end of the grease plug or the stiffness of the grease,or both o'f these properties, are taken advantage of to prevent theescape ofthe plu either by rotation thereof or by direct wit drawal.

I claim: y

' l. In combination, a grease cup and a grease plug litting Within saidcup and havsaid grease cup being `provided with interior longitudinalgrooves with the ends of said grooves adjacent to said plug.

2. In combination, a grease cup having interior screw threads, a greaseplug having exteriorscrew threads engaging said cup,

terior longitudinal grooves cutting across said screwvthreads.

3. In combination, a grease cup, a grease plug having screwv threadedengagement with the grease cup, and having on its' en d the grease, saidgrease cup being provided thereto by its smaller base,

y my naine.

with longitudinal interior groovesY adapted to permit the greasetoflow'up around the extended end of the grease plug. f

` 4. In combination, a grease cup, a grease plug -having screwv threadedengagement therewith, a frusto-conical projection on the inner end ofthe grease plug, being joined grease cup` being provided withlongitudinal grooves inthe inner Wall of the grease cup.Y

5. In combination, a grease Cup and grease plug itt/ing within said cupand have ing screw threaded engagement therewith, said grease cup beingprovided with interior longitudinal grooves with the ends of al u andvsaid ,saidv grooves adjacent to` said plug, and

means acting between the plug and the u, i;"rooves provided in the cupto prevent rotation of the plug relatively to the cup.

6. Incombi'nation, a grease cup having interior screw threads, aninteriorly and exteriorly screw threaded bushing therein, said'bushinghaving longitudinal grooves `onthel inside thereof, and a screw plugenga ing said bushing.

n testimonywhereof, I have Vsubscribed OTIS N. TERRY.

Witnesses: v

' LrLLIAN A. KIBBY,

ANNIE C. COURTENAY.

